Move classes into separate files

FossilOrigin-Name: 14861826d4c1f561aca909afe773366a46b57b20cf41fd668092dfb98d960d80

src/MapModelInfo.h

@@ -0,0 +1,16 @@
+#import <ObjFW/ObjFW.h>
+
+OF_ASSUME_NONNULL_BEGIN
+
+@interface MapModelInfo : OFObject
+@property (nonatomic) int rad, h, zoff, snap;
+@property (copy, nonatomic) OFString *name;
+
+- (instancetype)initWithRad:(int)rad
+                          h:(int)h
+                       zoff:(int)zoff
+                       snap:(int)snap
+                       name:(OFString *)name;
+@end
+
+OF_ASSUME_NONNULL_END